Answer:
distance between school and home is 21 miles
Explanation:
given data
in rush hour speed  s1 = 28 mph
less traffic speed s2 = 42 mph
time t = 1 hr 15 min = 1.25 hr
to find out
distance  d
solution
we consider here distance home to school is d and t1 time to reach at school
we get here distance equation when we go home to school that is
distance = 28 × t1    .......................1
and when we go school to home distance will be 
distance = 42 × ( t - t1 )
distance = 42 × ( 1.25 - t1 )     ...................2
so from equation 1 and 2 
28 × t1 = 42 × ( 1.25 - t1 )
t1 = 0.75
so
from equation 1 
distance = 28 × t1 
distance = 28 × 0.75 
distance = 21 miles
 
        
             
        
        
        
When smoke particles pass between the source of radiation and the detector the drop in radiation will be sufficient to tigger the alarm. <span />
        
             
        
        
        
Answer:

Explanation:
If the weight  is a linear function of the amount of fuel, the following correlation is fulfilled :

we solve the equation:

 
        
             
        
        
        
Explanation:
The U.S. launched its first man into space in May 1961. 
 
        
             
        
        
        
Answer:
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